If we're not taling computers, then it's got a small k and means a thousand of whatever follows, eg 1 km = 1000 m, 1 kg = 1000 g etc.
If we are talking about computers or other binary systems, then it refers to 1024 times, and it gets a capital K, e.g 1 Kb = 1024 b, 4KB = 4096 B etc.
Honest, confusing but true.
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